Discussion
Which quantity does an altimeter actually measure?
Answer: B
A pressure altimeter is an aneroid barometer with a scale calibrated according to the standard atmosphere, so it reads true altitude only when the actual atmosphere matches that standard. Consistency between aircraft matters more than absolute accuracy, which is why all aircraft above a transition level use the same setting. A radio altimeter measures true height above the terrain and is a separate instrument. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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